set -euox pipefail

gem install bundler

if [ -v STYLE_CHECKS ]; then
  set +ux
  exit 0
fi

if [ ! -v IMAGEMAGICK_VERSION ]; then
  echo "you must specify an ImageMagick version."
  echo "example: 'IMAGEMAGICK_VERSION=6.8.9-10 bash ./before_install_linux.sh'"
  exit 1
fi

# remove all existing imagemagick related packages
sudo apt-get autoremove -y imagemagick* libmagick* --purge

if [ ! -v TRAVIS ]; then
  sudo apt-get update

  # install build tools, ImageMagick delegates
  sudo apt-get install -y build-essential libx11-dev libxext-dev zlib1g-dev \
    liblcms2-dev libpng-dev libjpeg-dev libfreetype6-dev libxml2-dev \
    libtiff5-dev libwebp-dev vim ghostscript ccache
fi

if [ ! -d /usr/include/freetype ]; then
  # If `/usr/include/freetype` is not existed, ImageMagick 6.7 configuration fails about Freetype.
  sudo ln -sf /usr/include/freetype2 /usr/include/freetype
fi

project_dir=`pwd`
build_dir=${project_dir}/build-ImageMagick/ImageMagick-${IMAGEMAGICK_VERSION}
if [ -v CONFIGURE_OPTIONS ]; then
  build_dir=${build_dir}-${CONFIGURE_OPTIONS}
fi

build_imagemagick() {
  mkdir -p build-ImageMagick

  version=(${IMAGEMAGICK_VERSION//./ })
  if (( "${version[0]}" >= 7 )); then
    wget https://github.com/ImageMagick/ImageMagick/archive/${IMAGEMAGICK_VERSION}.tar.gz
    tar -xf ${IMAGEMAGICK_VERSION}.tar.gz
    mv ImageMagick-${IMAGEMAGICK_VERSION} $build_dir
  elif (( "${version[0]}${version[1]}" >= 69 )); then
    wget https://github.com/ImageMagick/ImageMagick6/archive/${IMAGEMAGICK_VERSION}.tar.gz
    tar -xf ${IMAGEMAGICK_VERSION}.tar.gz
    rm ${IMAGEMAGICK_VERSION}.tar.gz
    mv ImageMagick6-${IMAGEMAGICK_VERSION} $build_dir
  else
    wget https://www.imagemagick.org/download/releases/ImageMagick-${IMAGEMAGICK_VERSION}.tar.xz
    tar -xf ImageMagick-${IMAGEMAGICK_VERSION}.tar.xz
    rm ImageMagick-${IMAGEMAGICK_VERSION}.tar.xz
    mv ImageMagick-${IMAGEMAGICK_VERSION} $build_dir
  fi

  options="--with-magick-plus-plus=no --disable-docs"
  if [ -v CONFIGURE_OPTIONS ]; then
    options="${CONFIGURE_OPTIONS} $options"
  fi

  cd $build_dir
  CC="ccache cc" CXX="ccache c++" ./configure --prefix=/usr $options
  make -j
}

if [ ! -d $build_dir ]; then
  build_imagemagick
fi

cd $build_dir
sudo make install -j
cd $project_dir

sudo ldconfig

set +ux